COMPRESSORS, GAS TURBINES AND JET ENGINES QUIZ

Isentropic power to the power required to drive the compressor

Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio

Volume of free air delivery per stroke to the swept volume of the piston

Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor

Lower

Dependent on other factors

Higher

Same

(W₁ + W₂)/W₁

W₂/(W₁ + W₂)

(W₁ + W₂)/W₂

W₁/(W₁ + W₂)

30: 1

15: 1

7: 1

50: 1.

0.1 bar and 20°C

1 bar and 40°C

1 bar and 20°C

0.1 bar and 40°C

High altitudes

High speeds

Low altitudes

Low speeds

One sixth

One fourth

One-half

Same

Decreases

First increases and then decreases

Increases

First decreases and then increases

Decreases with decrease in compression ratio

Increases with increase in compression ratio

Decreases with increase in compression ratio

Increases with decrease in compression ratio

Better mechanical balance

Less loss of air due to leakage past the cylinder

Lower volumetric efficiency

Less power requirement